There is a typo in different parts of the MAPDL documentation which is that it should be 0.1 and not .1:
By default, the <replaceable>LENGTH</replaceable> is set to .1
The issue is that spaces before periods and comas are removed to have a nicer rendering in the all documentation.
However, this case is not properly handled as it comes from a typo (it should be 0.1 and not .1).
Thus, to .1 is translated into to.1.